:root {
  --fondo: #18171c;
  --titulo: #1fa0d9;
  --subtitulo: #2a9be1;
  --links: #1b698d;
  --linksHover: #2591c4;
  --boton: #0085c8;
  --botonHover: #014c72;
  --texto: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--fondo);
  color: var(--texto);
  font-family: Arial, Helvetica, sans-serif;
  text-align: justify;
}


/************************************************************* 
  MOBILE SCREEN
*************************************************************/
h1 {
  text-align: center;
  margin: 1rem auto 2rem;
  color: var(--titulo);
}

h2 {
  color: var(--subtitulo);
}

p {
  width: 95%;
  margin: 1rem auto;
}

a {
  text-decoration: none;
  color: var(--links);
}

a:hover {
  color: var(--linksHover);
}

hr {
  width: 95%;
  margin: 1rem auto;
}

.retocontenedor {
  width: 95%;
  margin: 1rem auto;
}

.retocontenedor p {
  margin: 1rem 0;
}

.retocontenedor ul {
  margin-left: 1rem;
}

.botones {
  width: 50%;
  display: flex;
  justify-content: space-around;
  margin: 1rem auto;
}

button {
  display: inline-block;
  padding: 0.25rem 1rem;
  outline: none;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: bold;
  background-color: var(--boton);
  cursor: pointer;
  color: var(--texto);
  border: 2px solid var(--boton);
  transition: 0.25s;
}

button:hover {
  background-color: var(--botonHover);
  color: var(--boton);
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type=number] { 
  -moz-appearance:textfield; 
}

/* Reto #1 */
.retocontenedor .palabras {
  margin: 1rem 0;
}

.retocontenedor .palabras label {
  display: block;
  margin: 1rem auto 0.25rem;
}

.retocontenedor .palabras input {
  display: block;
  outline: none;
  border: none;
  width: 15rem;
  padding: 0.25rem 0.5rem;
}


/************************************************************* 
  DESKTOP SCREEN
*************************************************************/
@media screen and (min-width: 1000px) {

}